My problem is that I've downloaded "The Sim3 all expansion packs" without seeing that it's an .dmg file instead of an .exe file which I need , but I extracted it to an .exe file afterwards..but now I don't know how to install it because there's an install guide for mac and I'm kinda dumb to figure it out how to do it on windows ..is it even possible?sorry for my bad english.

Hi! It doesn't seem your download came from Games4theWorld... I would advise you strongly to delete what you have and get your download from the page below, which contains the base game, all expansions and the latest fix, all in one single compressed file!